Using the new Chart (relational database) of nuclear quadrupole
deformation parameters β2 the systematical comparative analysis of those from various sources was carried
out for many even-even nuclei. The clear systematical disagreements of β2 values obtained from nuclear
quadrupole moments Q data and from reduced transition probability B(E2)↑ data were revealed. It was found
out that all nuclides (with only few exceptions) can be clearly separated into 2 groups: in one good agreement
is observed for data of both types, but in another deformation parameters β2 obtained from B(E2)↑ are
systematically (and in many cases – significantly) larger than those obtained from Q. It was shown that two
types data difference could be explained in the frame of assumption about the not-negligible role of
dynamical vibrations of nucleus surface, by other words - assumption about deformation parameter β2 value
dependence on surface vibration of nucleus in ground state. From this point of view β2 values obtained from
B(E2)↑ reflect not only static nuclear deformation (nucleus shape), but dynamic deformation also.
Comparison of the раrameter obtained with that obtained by another independent method could give to one
possibility for real discussion of such nucleus properties as toughness (rigidity) or, vise versa, laxity
(friability).